Problem 1 The American Water Works Association estimates that the average person in the United States uses 123 gallons of water per day. Suppose some business analysts believe that the actual figure is lower than this and want to test to determine whether this is so. They randomly select a sample of Americans and carefully keep track of water used by each sample member for a day. The data from this sample are shown below. Use or =0.05 to test this hypothesis. 105 80 119 146 144 158 56 107 141 85 95 69 65 88 93 58 98 102 117 103 104 103 148 111 108 100 164 136 175 96 156 71 127 136 163 111 99 131 103 133